Screen-cleaner.



PATENTED JAN. 13, 1903.

I.. WIIEEE. SCREEN CLEANER.

APPLICATION FILED APR. 9, 1902.

E0 MODEL.

M l l l @5&4

Witneses q.

Inventor,

Attorneys UNITED STATES PATENT OFFICE.

ISAAK WIEBE, OF ROSENFELD, CANADA.

SCREEN-CLEANER.

SPECIFIGATION forming part of Letters Patent No. `'7' 18,559, dated January 13, 1903.

Application tiled April 9, 1902. Serial No. 102,088. (No model.)

To all whom, it may concern,.-

Beit known that I, ISAAK WIEBE, a subject of the King of Great Britain, residing at Rosenfeld, county of Selkirk, Province of Manitoba, Canada, have invented certain new and usefullmprovementsin Screen-Cleaners and I do hereby declare that the following is a full, clear, and exactdescription of the inven- V tion, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an apparatus for cleaning the meshes of screens, and is" especially adapted for attachment to threshingmachines, the screens of which are particularly apt to become clogged with kernels of grain, partially-threshed ears, straws,'weeds, and the like, although of course-it will be Vuuderstood that my improved screen is also applicable to other apparatus in which screens are used and are apt to become clogged with material passing through them.

The object of this invention is to provide an apparatus which during the reciprocation of the screen shall brush over its surface on the under side and push out any small grains or straws that may become stuck therein, so as to free the apertures in the screen.

My invention consists,essentially,in a reciprocating frame mounted directly beneath the screen itself and having a series of transverse slats or bars, which are moved back and forth over the bottom side of the screen, and thus produce the effect hereinbefore mentioned. This frame is caused by certain attachments to a stationary part of the apparatus and to the reciprocating screen itself to have a reverse reciprocatio'n to the latter, so as to continually sweep past lthe orifices in the screen,and thereby continually clean the same of adhering matter.

My invention further consists in the peculiar construction and combination of parts hereinafter to be described, and particularly set forth in the claims'. y

In the drawings accompanying this description I have shown my improvement as applied to one type of threshing-machine, and here- Figure 1 is a central vertical section through the rear portion of a threshing-machine, showing a reciprocating screen adapted to bolt the threshed straw and to separate the kernels of grain therefrom, this screen being provided with myimprovement. Fig. 2 is a plan view of the lower part of the screen-frame, taken on the line 2 2 of Fig. 1. Fig. 3 is a fragmentaryperspective view showing the method of attaching my improved cleaner.

The same numerals of reference denote like parts-inall the figures of the drawings.

In Fig. 1 of the drawings, 4 represents the frame of the threshing-machine, whose rear wheel is shown at 5 mounted upon the axle 6. The screen-frame is designated by the numeral 7, and, as herein shown, consists of two upright sides 8 and a downwardly and forwardly slanting bottom 9. The frame 7 is mounted to swingupon two pairs of links 10 and 11, pivoted at 12 and 13 upon the side walls 14 of the thresher-casing, it being understood, of course, that only one side of the mounting isshown in Fig. 1. The swinging frame 7 carries four screens, numbered,.'respectively, 15, 16,17, and 18, mounted therein Vin the different elevations and at lthe differentangles shown, the uppermost screen 15 having a rearward incline and being adjustably mounted by a pair of rods or arms 19, sliding in a cleat 20, and being extended to receive threshed straw from the chute 2l and convey it after a certain amount of winnowing from the fan 22, mounted in the casing 23, to the second screen 16, which has likewise a slight rearward incline, but not so great as that of the rst screen. The screen 17 next below the screen 16 is substantially horizontal, and the lower screen 18 has a' forward incline, so that the threshed straw upon falling upon the screen 16 is sifted successively through the three screens 16, 17, and 18, the large'portions of the straw and weeds passing over the rear end of the several screens,while the coarse grain falls into a receptacle 24: and the finer grain and chaff are successively sifted through the three screens 16, 17, and 18. At 25 is shown one of a pair of obliquely forwardly directed deflectors or baiie plates which direct the air blown from the fan 22 through the center of the reciprocating screenframe 7.

The fan 22 has a pinion 26 on the arbor 27 thereof, which engages with a gear-wheel 28, driven by a belt 29 from the main shaft of the ICO threshing-machine, and the shaft 30, which carries the gear 28, carries also a pair of pulleys 3l and 32, over the first of which passes the belt 29, while over the other passes a belt 33, which works in connection with the pulley 34, carried by thejack-shaft 35, and with a belt 36, passing over the pulley 38 to reciprocate the screen-frame 7, which is accomplished by an eccentric 39, mounted on the shaft 40 of the pulley 38 and connected to the screen-frame by the link 41.

When the screen-frame 7 is in motion, the sifted and winnowed grain after falling through the screen 18 falls down upon the bottom board 9 of the frame and is delivered into a chute 42 at the forward end of the screenframe 7.

Thus far the machine described is merely a typical threshing-machine, which forms no part of my invention; but the attachment which forms my invention will now be described. It consists in a frame 43, formed of transverse slats 44, joined together by side and center longitudinal pieces 45 46, this frame 43 being mounted between the lower screen 18 and the bottom board 9, with its slats 44 directly in contact with the lower side of the screen, as shown, and it is caused to reciprocate in the following manner: Beneath the slats 44 of the reciprocating frame and between the longitudinal pieces 45 and 46 extends a longitudinal rod, (herein shown as an iron bar 47,) whose lower front end is bent downwardly and backwardly in order to enable it to be attached to a stationary post 48, mounted centrally on the axle 6 of the thresher-frame, although, of course, the bar 47 may be formed in any appropriate manner, so that it be attached to some stationary point on the frame. To the other end of this bar, which is directly under the rear end of the screen 18, is pivoted at a point 49 midway thereof a lever-arm 50, whose other two ends are respectively pivoted to the bottom board 9, as shown at 51, and to one end of a link 52, as at 53, and the other end of the link 52 is pivoted to the center piece 4G of the reciprocating frame 43, as indicated at 54.

When the screen-frame is reciprocated in the operation of the apparatus, the end 51 of the lever-arm 50 will be correspondingly reeiprocated, and inasmuch as the central pivot 49 of the arm is stationary the opposite end 53 will be reciprocated in the opposite direction to the screen-frame, thus reciprocating the frame 43 in inverse sense to the screenframe and casing, the slats 44 thereof being drawn back and forth across the lower side of the screen 18, so as to cut or brush away all protruding kernels, straws, or weeds, and thus to keep the screen 18 clear of clogging matters.

It will be understood, of course, that while I have herein for the sake of example shown my improved screen-cleaner as applied to a particular type of screen-frame and threshing-machine, yet this forms no part of my invention, and the latter may equally well be applied by such modifications as lie within the skill of an ordinary mechanic to any type of machine having a reciprocating screen and will serve its purpose equally well in this connection.

While I have shown in the accompanying drawings the preferred form of myinvention, it will be understood that I do not limit myself to the precise form shown, for many of the details may be changed in form or position without aifecting the operativeness or utility of my invention, and I therefore reserve the right to make such modifications as are included in the scope ofthe following claims.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of a reciprocating screen having a bottom board, a frame having transverse slats mounted to reciprocate longitudinally between the screen and the bottom board and adjacent to the lower surface of the screen, means for reciprocating said screen, and a lever-arm having a stationary pivot and connected at one point thereof to the screen and at another point to the reciprocating frame respectively.

2. The combination of a reciprocating screen comprising a perforated plate or diaphragm, and a screen-frame having a bottom board secured to and extending beneath the same, a screen-cleaner comprising a frame having transverse slats and mounted to reciprocate longitudinally adjacent to the lower face of said perforated plate and between said plate and said bottom board, and a lever connected at its respective ends to said bottom board and said reciprocating frame and having a stationary pivot at an intermediate point,whereby the reciprocation of said screen causes the reverse reciprocation of said screencleaner.

3. In a threshing-machine, a reciprocating screen comprising a frame having a bottom board, and a perforated plate or diaphragm mounted thereover, in combination with a screen cleaner comprising an open work frame adapted to reciprocate between said bottom board and perforated plate and adjacent to the lower side of the latter, a rod or bar connected to a stationary point of the apparatus and extending between said bottom board and the frame, a lever-arm pivoted to said bar and having pivotal connections respectively with said bottom board and said open-work frame, and means for reciprocating said screen to cause the simultaneous reciprocation of said screen-cleaner.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

ISAAK WIEBE.

Witnesses:

JAcoB S. REMPEL, JAMES 0. STEWART.

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